<?php

/**
 * @file
 * Contains the basic 'node_revision' field handler.
 */
class views_handler_field_node_revision extends views_handler_field_node {

    function init(&$view, $options) {
        parent::init($view, $options);
        if (!empty($this->options['link_to_node_revision'])) {
            $this->additional_fields['vid'] = 'vid';
            $this->additional_fields['nid'] = 'nid';
            if (module_exists('translation')) {
                $this->additional_fields['language'] = array('table' => 'node', 'field' => 'language');
            }
        }
    }

    function option_definition() {
        $options = parent::option_definition();
        $options['link_to_node_revision'] = array('default' => FALSE);
        return $options;
    }

    /**
     * Provide link to revision option.
     */
    function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);
        $form['link_to_node_revision'] = array(
            '#title' => t('Link this field to its node revision'),
            '#description' => t('This will override any other link you have set.'),
            '#type' => 'checkbox',
            '#default_value' => !empty($this->options['link_to_node_revision']),
        );
    }

    /**
     * Render whatever the data is as a link to the node.
     *
     * Data should be made XSS safe prior to calling this function.
     */
    function render_link($data, $values) {
        if (!empty($this->options['link_to_node_revision']) && $data !== NULL && $data !== '') {
            $this->options['alter']['make_link'] = TRUE;
            $this->options['alter']['path'] = "node/" . $values->{$this->aliases['nid']} . '/revisions/' . $values->{$this->aliases['vid']} . '/view';
            if (isset($this->aliases['language'])) {
                $languages = language_list();
                if (isset($languages[$values->{$this->aliases['language']}])) {
                    $this->options['alter']['language'] = $languages[$values->{$this->aliases['language']}];
                }
            }
        } else {
            return parent::render_link($data, $values);
        }
        return $data;
    }

}

